Speeding up small scale anaerobic digestion
Anaerobic digestion has been cited by the UK Government as a way of reducing carbon emissions, providing energy security and generating green jobs. A new project aims to push the technology forward...

Anaerobic digestion biogas to provide 10% of UK energy by 2020
The Anaerobic Digestion and Biogas Association (ADBA) predicts that farmers, commercial operators and local authorities will build 1000 anaerobic digestion biogas plants in the next five years at a cost of £5 billion, mostly funded by the private sector.

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Innovative bioenergy project scheduled to open at Calgren Renewable Fuels next month.

DVO’s patented Two-Stage Mixed Plug Flow™ differs from traditional anaeorbic digestion1 technologies that feature above-ground tanks, according to Steve Dvorak, owner and founder of DVO, Inc. The DVO anaerobic digester, built by Andgar of Ferndale, Washington, is designed to hold approximately 1,400,000 gallons of manure and organic waste. Each day, the digester will receive 55,000 gallons of solid and liquid waste from Four J Farm Dairy, a nearby dairy farm with approximately 2,000 head of cattle.

“The Calgren facility and Four J Farm Dairy will not be the only ones to benefit from the addition of DVO’s anaerobic digester,” said Steve Dvorak, owner and founder of DVO, Inc. “Our digesters reduce the environmental impact from farm waste greenhouse gas emissions by over 90 per cent, pathogens in the digested waste are greatly reduced -- often to the point of non-detection -- and up to 97 per cent odor reduction is achieved as biogas is burned.”

Biogas, one of the many valuable byproducts of the anaerobic digestion process, will replace thousands of gallons of natural gas currently being used by the Calgren on-site cogeneration facility to produce 55 million gallons of ethanol each year. Biosolids, another beneficial byproduct of anaerobic digestion, will be sent back to Four J Farm Dairy to be used as a high-quality and low pathogen count cattle bedding. Liquid nutrients from the digestion process will also make its way back to the farm to fertilize growing crops.

REFERENCES

Anaerobic digestion is a collection of processes by which naturally occurring microorganisms transform waste into valuable byproducts in a controlled, oxygen-free environment

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